Error When Viewing Projects or Timesheets in Administration View

Some time cockpit beta users reported problems when viewing projects or timesheets in the administration module. The following exception occured when they tried to open a list of projects or timesheets:

Object reference not set to an instance of an object.

at System.Windows.Automation.Peers.AutomationPeer.EnsureChildren()
at System.Windows.Automation.Peers.AutomationPeer.UpdateChildrenInternal(Int32 invalidateLimit)
at System.Windows.Automation.Peers.AutomationPeer.UpdateChildren()
...

Finally we found out that this exception was caused by a windows service named "Tablet PC Input Service" and it is unique to entities that contain date and time fields. Stopping this service solves the problem.

Find more information under http://connect.microsoft.com/VisualStudio/feedback/details/316681/nullreferenceexception-in-system-windows-automation-peers-groupitemautomationpeer-getchildrencore.

Workaround

To resolve this problem stop the "Tablet PC Input Service".